Doomsday Vault Unlock Guide (Cities: Skylines)

Doomsday Vault
DLC	Natural Disasters
Building Type	Monument
Level/Category	N/A
Build Cost	₡1,600,000
Upkeep Cost	₡17,600/week
Milestone Required	Megalopolis
Noise Pollution	0
Effect	Improves city-wide emergency shelter services
Buildings Required	Meteorite Park Disaster Memorial Helicopter Park Pyramid of Safety Sphinx of Scenarios Sparkly Unicorn Rainbow Park

The Doomsday Vault is a monument that comes with the Cities: Skylines Natural Disasters DLC.

To unlock the Doomsday Vault you need to reach the Megalopolis milestone, unlock all 9 map tiles, and you’ll need to construct these six unique buildings:

All 6 unique buildings listed above are from the Natural Disasters DLC as well.

Once you have unlocked & built those six buildings, you will be able to build the Doomsday Vault from the Monuments menu for 1,600,000. Upon construction, the Doomsday Vault will improve the services of all shelters in the area (i.e., greater capacity for evacuees and larger stockpiles of resources).

Below is a basic guide to unlocking the six Natural Disasters unique buildings that you’ll need for the Doomsday Vault.

Meteorite Park

The Meteorite Park

Meteorite Park
Building Type	Unique Building
Level / Category	Level 1
Milestone Required	Worthy Village
Build Cost	₡10,000
Upkeep Cost	₡16/week
Entertainment Value	60
Noise Pollution	10

Unlocking the Meteorite Park requires you to experience a meteor strike.

You can manually spawn a meteor strike on your map (a safe distance away from your buildings), making this a very easy unlock.

Step 1: Go to the Landscaping and Disasters menu, and click on the Disasters tab.
Step 2: Select the Meteor Strike.
Step 3: Right-click on the map, somewhere far from your city’s buildings. After a while, a meteor will fall on that location.

Disaster Memorial

The Disaster Memorial

Disaster Memorial
Building Type	Unique Building
Level / Category	Level 2
Milestone Required	Tiny Town
Build Cost	₡22,000
Upkeep Cost	₡320/week
Entertainment Value	60
Noise Pollution	25

To unlock the Disaster Memorial, you must experience the following disasters:

Tsunami
Thunderstorm
Meteor Strike
Sinkhole
Tornado
Earthquake
Forest Fire

Just like with unlocking the Meteorite Park, you can manually spawn in these disasters from the Disasters tab of the Landscaping and Disasters menu.

You can spawn disasters from the Disasters tab of the Landscaping and Disasters menu.

However, the scale of destruction of these disasters will be much larger (some will affect your entire city).

You can work around this by creating a save file before hitting your city with disasters, and making sure autosave is turned off before spawning disasters.

Once you’ve unlocked the Disaster Memorial, close the game without saving. You’ll still be able to build the Disaster Memorial once you revert to your “good” (i.e., pre-destruction) save file.

Helicopter Park

The Helicopter Park

Helicopter Park
Building Type	Unique Building
Level / Category	Level 3
Milestone Required	Boom Town
Build Cost	₡80,000
Upkeep Cost	₡560/week
Entertainment Value	60
Noise Pollution	10

To unlock the Helicopter Park, you must build the following service buildings from the Natural Disasters DLC:

Police Helicopter Depot
Medical Helicopter Depot
Fire Helicopter Depot

SCROLL

Building	Menu	Milestone Unlocked	Cost (₡)	Effects
Police Helicopter Depot	Police	Big Town	60,000	Patrols city and reports suspicious activity to ground units for apprehension
Medical Helicopter Depot	Healthcare	Boom Town	50,000	Transports patients from hard-to-reach areas to hospitals/clinics
Fire Helicopter Depot	Emergency Services	Busy Town	55,000	Able to put out forest fires (whereas firetrucks cannot) Also puts out building fires

Building

Milestone Unlocked

Cost (₡)

Effects

Police Helicopter Depot

Police

Big Town

60,000

Patrols city and reports suspicious activity to ground units for apprehension

Medical Helicopter Depot

Healthcare

Boom Town

50,000

Transports patients from hard-to-reach areas to hospitals/clinics

Fire Helicopter Depot

Emergency Services

Busy Town

55,000

Able to put out forest fires (whereas firetrucks cannot)

Also puts out building fires

Building a fire helicopter depot

Building a Medical Helicopter Depot

Building a police helicopter depot

Pyramid of Safety

The Pyramid of Safety

Pyramid of Safety
Building Type	Unique Building
Level / Category	Level 4
Milestone Required	Busy Town
Build Cost	₡120,000
Upkeep Cost	₡800/week
Entertainment Value	70
Noise Pollution	20

Unlocking the Pyramid of Safety requires you to experience destruction without casualties.

To clarify: this means a building or structure must be destroyed by a disaster, but without anyone being harmed.

Here’s an easy way to do this:

Step 1: Build an isolated structure to destroy.

Select an empty part of the map away from your buildings. Then build a segment of road unconnected to the rest of your road network.

Place along that road a small ploppable building that doesn’t come with service workers (a taxi stand or small park asset works well for this).

Step 2: Spawn a disaster with a small area of effect

Go to the Disasters tab of the Landscaping and Disasters menu and choose a disaster with a small destruction radius. A sinkhole is perfect for this purpose.

Spawn it on top of your isolated structure.

You’ll want to spawn a disaster with a small area of effect (like a sinkhole) on a structure away from your citizens.

Once the sinkhole hits—destroying the building without harming anyone—the Pyramid of Safety will be unlocked.

Sphinx of Scenarios

The Sphinx of Scenarios

Sphinx of Scenarios
Building Type	Unique Building
Level / Category	Level 5
Milestone Required	Big Town
Build Cost	₡250,000
Upkeep Cost	₡3,200/week
Entertainment Value	70
Noise Pollution	25

The Sphinx of Scenarios is unlocked by winning any 3 scenarios in the game.

You can select the scenario you want to play from the New Game screen.

Take note that unlocking the Doomsday Vault requires the Sparkly Unicorn Rainbow Park, since that requires you to beat all five scenarios from the Natural Disasters DLC.

So it would be most efficient to choose three Scenarios from Natural Disasters if you want to get the Doomsday Vault as soon as possible.

Below is a list of all the official scenarios (as of game version 1.16) and a brief description of their main objectives.

Scenario Name	Summary	DLC
Alpine Villages	Transport 250,000 using public transport in under 350 weeks.	Natural Disasters
By the Dam	Grow population to 65,000 in under 300 weeks, while dealing with flooding from an overflowing dam.	Natural Disasters
Floodland	Survive for 120 weeks while constantly rising water levels threaten to wipe out your town.	Natural Disasters
Island Hopping	Reach 250,000 population on an archipelago map with a very small amount of buildable land.	Natural Disasters
Tornado Country	Reach 250,000 population and 1,000,000 while dealing with tornadoes.	Natural Disasters
Ferry Empire	Reach 25,000 population and transport 250,000 passengers via ship transport	Mass Transit
Fix the Traffic	Get 82% traffic flow in a city plagued with congestion and awful city planning.	Mass Transit
Trains!	Construct 210 instances of Train Tracks and transport 200,000 people using trains	Mass Transit
City of Gardens	Construct 10 different park/plaza buildings and build 5,000 squares of organic and local produce specialization	Green Cities
Clean-up Crew	Clean up the city’s water source to avoid contamination, and grow the population to 75,000	Green Cities
Green Power!	Have a population of 50,000 using only clean (non-polluting) energy sources	Green Cities

Sparkly Unicorn Rainbow Park

The Sparkly Unicorn Rainbow Park

Sparkly Unicorn Rainbow Park
Building Type	Unique Building
Level / Category	Level 6
Milestone Required	Small City
Build Cost	₡500,000
Upkeep Cost	₡5,120/week
Entertainment Value	120
Noise Pollution	10

The Sparkly Unicorn Rainbow Park requires winning all 5 scenarios that come with the Natural Disasters DLC.

These are:

Scenario Name	Win Conditions	Lose Conditions
Alpine Villages	Transport 250,000 using public transport	Fail to reach the target under 350 weeks Population under 1 Run out of money
By the Dam	Grow population to 65,000 while dealing with flooding from an overflowing dam.	Fail to reach 65k population in 300 weeks Population under 1 Run out of money
Floodland	Survive for 120 weeks in a map with constantly rising flood	Own more than 4 city tiles Run out of money Population under 1 after playing 15 game weeks
Island Hopping	Reach 250,000 population with a very small amount of buildable land. Average citizen health must be over 20%	Run out of money Population under 1 after playing 15 game weeks
Tornado Country	Reach 250,000 population while dealing with tornadoes. 20,000 full lifespans lived in your city ₡1,000,000 in the bank	Have less than -30,000₡

How To Reach the Megalopolis Milestone

You can only build monuments upon reaching the final population milestone, Megalopolis.

This can be anywhere from 20,000 to 90,000 citizens.

Generally speaking: the more buildable land a map has, the higher the required number of citizens per milestone.

Unlocking All 9 Tiles

You get a single tile at the start of each game and can expand up to 9 (if playing without mods).

You unlock each of the 8 remaining tiles at different milestones:

Tile	Milestone
1	N/A (available at start)
2	Worthy Village
3	Boom Town
4	Big Town
5	Big City
6	Capital City
7	Colossal City
8	Metropolis
9	Megalopolis

Each time you hit one of these milestones, you can choose a new tile to purchase by going to the Areas panel.

The Areas panel where you can purchase new tiles

You may only purchase a tile that is right next to any of the ones you already own. Each succeeding tile is more expensive than the previous one.

Tile prices can also vary depending on the map and the amount of buildable land.

Doomsday Vault Tip: Start the Natural Disasters Scenarios Early

The first four unique buildings for the Doomsday vault are very easy; it is the Sparkly Unicorn Rainbow Park that makes this monument very difficult to obtain.

Two of the Natural Disasters scenarios require reaching 250,000 population, which can take quite a long time in-game. (And Island Hopping is especially challenging.)

So it’s best to start progressing on these scenarios rather than saving them for last.

Besides, you can also unlock the lower-level unique buildings (Meteorite Park, Disaster Memorial, Helicopter Park, and Pyramid of Safety) in the course of playing the scenarios for the Sparkly Unicorn Rainbow Park.

Also don’t forget that Sphinx of Scenarios only requires you to beat any three scenarios, which means you can unlock it as you work towards the Sparkly Unicorn Rainbow Park at the same time.

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Liz Villegas

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Liz is a writer and photographer with a love for building and strategy games. Her spare time is often split between lifting, reading, drawing, annoying her dog Mr. Porky Butt, and squinting at stat tables on the wiki pages of whatever game she's currently playing.

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